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Thie history of the lamp is a bit more complicated.
Ir ius stamped BR(sc), so that dates it after 1948. BR phased out steam trains by Aug 1948, by then most oil fired lamps had been replaced by battery lamps. On the trains by DC powered lamps.
The way the glass is held in place, by the 3 flip feet dates it to the 1940's. Made it quicker to replace any broken glass. But having the three glass lens dates it to pre 1938. After that only the red and green was in use. Cut down on the cost.
But the front lens is older than that, but the date can not be verified.
With a lot of help from Steam at Swindon we think it was assembled in the late 1940's to early 1950's.
As a way to quickly produce lanterns to be used by guards, shunters and in the Marshaling yards.
The Br (sc) is an early part of Br Scotland, a R was added later.
The BR(sc) was added after the lamp was made. There are BR stamps on all the other parts, but is clear that it was added later.
The fuel tank as some thing removed from were a region railway would of been.
It is a very interesting lantern, lots of history.
Many thanks to the staff at Steam for their help.
https://www.steam-museum.org.uk/